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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0d4d6711cb6e8d3cbe0705b5230bfdf51ec5ddb74e8867a350dfff670581bf' 
  AND token = 'V4p851CpLttIFHkfGeklkQXQTS39Mf6YNBoOLRxdFKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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