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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec74ca0cce2f1467a3ab49f2bad4449b87862c5b5b740162ef9ad072ffd71a60' 
  AND token = '5HBpJyj3usNkeJcX/0NyOqHcE6U2jPlNZp3M/DY7Q5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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