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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bc5a989ceaf71fbe121c92ba29d2cc3c318426d728670f060a3878d7ee68e7' 
  AND token = '+IE2eVUw5SCYWe9Y95NK1l4UTEbhutMCOufzTz84n7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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