Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce0f797540900bd12ef4b163821603fb7fadfdbe19ca90b7b56a804234f70bc' 
  AND token = '7IYrRWNrqpA546b7O4DtCSumKOnHjG97oltLpLBxB2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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