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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cc8d1822659f6c487b3d4d2b765c247fd45d6b970cb44cb59bc3eeba38d7c6' 
  AND token = 'OxJ0PitiXCm+3x+cioviICDLmWIZBuFtNU4nEgdE94I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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