SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ea9c6353e323bb686f50938a97111b45765f3de07809029df4a627dafe22b8' 
  AND token = 'I9P2G1BKLM5sMtVQgUZDI7DWF9+jIOel6hxx+nP5uz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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