SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2075855d254e83947bfc9c65827613f3e7ee474a3062f692624c42b6eabebe6e' 
  AND token = 'ClWN8X9qUR1pgmsUOryJ++3UujZtzELIJOF5XsiBBcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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