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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b23cbc72ae2a6fb412db1717ac13a3f4c0f6fb816dae4f822cac78af754177' 
  AND token = 'b/sH+i4k2BhkGXCbidD5VepixokBmTv2kbhkUxi7nh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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