Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc76deb73a5df670e1d19ad6dd57ab0e6bfdbcb57232b9cb9397af6ec6f8128c' 
  AND token = '3DPLJ1rVLjxhlndvHKbe1ymg9YX3hmgyOTVMOqmJ15U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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