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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487265b2e64efafccddfe050153d334a8c4d7e07cab1d0ee60656d4bffd99609' 
  AND token = 'Y3x91b1pCLgCIXx7Vk/7+ShZ5OFWNUh2CZUSenjQ1m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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