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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0833a5b5560e1926b5505726269a6cff25524754b36e00658925d48775a5d25' 
  AND token = 'Jz5hWpPRrsrBPhY6yJPpa6ZN9TG9Uvx9FZGyMJW6RDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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