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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0872945c67c7d2acbe6a3f39ad474f87a8258dc53d9e1d2f3dfd67d3499b4359' 
  AND token = 'AGRdfYGZk+rc9eji35hidJWylMYo+p6frGOJ/co8ioc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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