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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2d5228af44e1811db7a161055d118e71ae683d345ea1f2b61b6d0855fae26f' 
  AND token = 'rv7h7jmSJMK2ln6/iFSvW0OK9gAO+gS6q/H75nDNpB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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