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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa47af4a7bea8e61505fc2b5c133af6c227474a315ea8101b4cdda3a15c48be8' 
  AND token = 'qL5AlbrnUXQL3xsiYP9RiOLNcht20iKQ0+KhdjgccoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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