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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7d26debc7cfdbd4e5d87a18d2b829ff3f47b74215388dab3761cc8414cdf80' 
  AND token = 'nS3D8WbyioVj6Y9Ui/NoWNJbusiekDT0nO/Drk/hmWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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