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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4129b20f7c6b4cb2bb61412bc626f2d6d17afe28ab46f2a6c39c75ef62eddff' 
  AND token = 'ymJ9XkYDl40TChyu8RWsTiyW0vsAyUtA0r3NYob74j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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