SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650f7a53269ed5e17bee94749fb422cc129a2dc3d762c462f67444ab8b6d53cd' 
  AND token = 'VB8P9KG0Iki+dP0n/vuhm/X4DUhG/OULAuUYPuBBj0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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