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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f063debae0d7c0bc11498775e731fe5ae1a8be0415b81bacbc2cf7803dda9e0e' 
  AND token = 'bnmQSYNerkcaed1N05LRYkWbQxxhVwMY2sYYt7Xha9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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