SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7df9d434588b6b01e6be22bca2dd59eb1f2aa692f21ad77738e4aa1074eb25b' 
  AND token = 'OSNhS27JLMkvOwRzSRgN+OWeLxgxFQTJXj/RNZAXQKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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