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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669a66183b07c365ed3dcb59e7b9b40db0ba25afee6d33076e1ed449defd631f' 
  AND token = 'f3nZtHDvduE5EYaGrisyIFZOi7vXr0pFs5uRLC3TfFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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