SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c106d7fa9c43f8959649e22416f9924e033d01aca885b1f9c25418d3a2a36b' 
  AND token = 'S8HEkz1z3ROb0VX/cWsChZGUwvjnPgEqGOqOOROvuqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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