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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0252767e3f45385a939cb4512043e422d717485e4ebe665826530554d49acf' 
  AND token = 'kAaPNiL+0rkPnCcSU4+RVhdIHKFJP5pb2CLlLIrwoKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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