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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e0de3f59c33cdb734f07410be5811ce7c16c03443545be49c7fe5b95c08a2c' 
  AND token = 'Dei6yaV8AF5nxGHbel3cdjohF7i874DvYaZny2A8mS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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