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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdf0663ed59f2d85abcbfd74d45324bded83e50e5fc559bb5adfbc7208b237d' 
  AND token = 'CkmPmnR5MnYllmZQEj0oxM3J1ThNgfjP6UTWtoVUDrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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