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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd00b8bea1de17aebec0a92e7d4eebdd6419b8b3c0967acd7988f36b76b5d16d' 
  AND token = '25ULxGnxRjs4HKeOfrOq+h91LtjLWkDy6SJFvJcwemI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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