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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7041246703d4624b41236d98ace1504e954402b0927d5801d4e47d96e48ae5' 
  AND token = 'lJGwxiG7rBcXlGjlRr8srimJftO3WDH1JxWQoiLfSJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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