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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d0db7daddbbf34bade7e7d5050614cc11b91a644c0292e1e4e693c5d6cb8d0' 
  AND token = 'G7QUr+8OBduYH8JX0XtmvTRRBrYN7NK4f6n1OS99GhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}