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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2334fc7ec4ce1e38ba78cdfc23a39c312a7b84e775e3a8c45f672e74c60df68' 
  AND token = 'DnD0vSkPbUUVzjMTUt/wcx1BuzE1VJZ6jUAdk9GDR50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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