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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7e5629645611a55ea43213f5c73497d181c8496c37bebccfd8197076719c69' 
  AND token = 'R25tw3xH1upBxM8XJCnq7aFlo5OqZR5nLt0hVaMpGWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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