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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7495d1271e7de5831cea2945056c60d0160a07223ab52912cf88db0649063b55' 
  AND token = '8QZkM8MiMA8OhNzlEv7+9Y/nog38QXSF9EXvfwJM/ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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