SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4769e144ebb73bd8a0f97583d101d5bc5437d2c82285e55fb2676cd5b525d900' 
  AND token = 'lr/aHB+sbJ+W5fzBoYhChog3vy/tPmTAbw3IOsK7fDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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