SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93570595b9fdf3baa6491e30dab2df8952e9d23b1fdc5584ad0b9bd4174acfe' 
  AND token = 'AQ7h+CimNKhqdHEZvZZFUEsjH69crDgr+RtKT4Uqvbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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