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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ceed0b14afd4f50f680afa08dc7d494368c64af454655e0d4667e62e18ab0d' 
  AND token = '4B0boaAbleSjJo1nA9NOeX46hgsEhhb06svssDybS50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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