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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5bfbff8a7cd61bd529498ab9276aa0bbc4136b5d2db3cec738ff4e56edfba7' 
  AND token = 'd5DDtyyi5cYrsK9eVie5SOZZ1HYZCXMqw8e02LC1sUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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