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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48498039f0ee5f4a735dc0de7a6d8cd3ccc03e4768127b4621ec699b23ca3e89' 
  AND token = 'I5cezWq9lNuF/suIzW19kggTVA8EA5gmOi/38V20gbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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