SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac91473763556e89878283b83ed25fae463dc1b66714769b9dffdf12a9fa957' 
  AND token = 'OEBuTzJ+IT/LqFZIljdsQZVO8ArOEqUAHH4IuIY+kZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00194

JSON explain

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