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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b9b2eec7293c90563b081b16f9aa079a3c4d90cd46551b9ba521d619045ab0' 
  AND token = '/Ydi8jodxIp/5oIFhBxd6eLV4DABt00IRLpuN8v1siM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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