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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46004d2ad19e5bdece8f6cf457d931fde5e1a523854fc39001d26208a16aff2' 
  AND token = 'cpej5lMH7viGE3righct7d+/+ongNnXhEt6CDFg0J2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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