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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff434c52ee0e1b070a8d0590daf8c469c42930ae665a7dc0f715d48ec3b40b6c' 
  AND token = 'uKiFUjKHjS+YHYKFC9jZBlDdIBB7fV0OeV4EtgpzeME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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