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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74213902b3cabf71e0eb23d4b70ca945a73f068c2b7d460cf5db70eed03364c6' 
  AND token = 'k9dZmg4FTxgGffdSKazss5n6sr1efffK6yyd+DYde+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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