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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35696d2abea6a0113bf5b0d0876db56194c6facdc450634e4a97467e0fb0499d' 
  AND token = 'P/8jTlXoDAWnzFk96icBejo8GZY/6qgcH1fOO8Q2SJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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