SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb25d573c96aa88f912c49c77566f7a28935754a41ac40aff218b10f784bfc7' 
  AND token = '+3aC/J/qTo2n9gGd2ZV+DCsoADZ8Foe9GW3P5x35LjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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