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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058f3db6e118ee9e147141ddb9de27d1f864519cb0da11bb3b00cb143ae4b199' 
  AND token = 'QLiV4r+MLgaey4034ZIrRHa0T4+wzGtWzA7X65ZxXZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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