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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef4fe6facca93f25672a9ea2ca342a3cc6160c7d5fb93a9a33a13ef1f05171f' 
  AND token = 'DkljFRubqj4Nplyw7/IZeVRy9Zeyn6WDvcxrQKUckgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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