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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0004aa0fd9c1f97add80149ff26bf4413adb9f3f385a98be3811f4c30bd30b3' 
  AND token = 'nT8pEEK8TxDA25pBVO5P+HW9L+LIGhZOtOQtdEVyD9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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