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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d87abba90c8d9305e976724560bea9b31b2679ef8ff1be567e32684c171131' 
  AND token = 'WA+M5QNprFciU6WrKZWaxth5AWsUgWG9QEKSyj4pL7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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