SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41afa0b44075b488930b2d2dcb7ad3dc76a3b976ea804d7931726dd8b81b5204' 
  AND token = 'ZJdnLJIUHayFyfuu+wDluYN9/vz9thuKcMD/2G1YeVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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