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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677a4f6a389c730f82adf33135d8308c1e9802a6405920587285ce8b0a40c689' 
  AND token = 'gfp1rbP1VE4lZ78cn/5xcpeDD6tGEU6gCf+p3VGpHCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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