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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82be1e2f454769667c82b0ea40eab34691464df81be6d4aaccc264ce9ed9b7a4' 
  AND token = '3XftMW5PjuVr//y/5WLAySuqX4MwsaiTyzC0LXrR8M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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