SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72435ce493ace3500892a580853d74b637d550f5e798f9453286f5e6529eb7eb' 
  AND token = 'JpzVFU3Xq6KtipmTd+vY8oMjrMZ/jxAsaJ23yRi1PHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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