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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6558b68c02722f5c34b332970c905e5911ca60b9eb0ffccf5ba0dd798f64474d' 
  AND token = 'ahfVJfW0J5DzQchfu0AUXlPM3u8Wa6EYwWUwZJuC2kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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