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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86785694dec394aecc9f3d9b2722a39551f2cbc7930764d07ba8475cfaca0ab' 
  AND token = 'mU24fk5nZv5L4d6Yz3fGVYIaK/vsru1crkCa9brGAQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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