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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2887d1e3173b091b13c37a914f3c60acb3be9cf9a2e108cc79ff6818d9b073c6' 
  AND token = 'eww/d9P/N66IRhbW28wVpY8+11qWzWWxf9DuYv9Jd7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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