SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7407d9a38c5154ecc5137e2bba187375798bb9d6a53b6deb6f0038b3d5d12022' 
  AND token = 'JTGbE3QS/Dkob59DRfvtvmGsYQDHsBswFqslxapHvVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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