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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985ca5a4c94d55408201ce9b864081b9a8e8cdae64940ec0931c9abf3dc0d4e8' 
  AND token = 'pAGVNKbEAQ3tbd/I6nTIt/LeSsWvk4MUTJuhS9QLNmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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