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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c952fed21e2a4b9654c9300419de6b6df54170387ecdceabf0a6f518e26e2143' 
  AND token = 'rGkXmz+kA8Nd5W0xLEDXahNCVix61J9LgPSfUxrs2UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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