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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d75b7a50135989b92fd4e8fd86577c015b7cac8d6c0c2d9ad4d3839dc090fc9' 
  AND token = 'mgFFrNbX/d7qPxeQDEJ1EC1QsCBQyTn2Vnb9e2hvoZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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