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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774e7ede0b8751d2869cba9c2d75a840af17c2938d83b67e3fe6d2ce8e1a302d' 
  AND token = 'K6nN+/60MRFqMKyEYJrQK0tcx/XASu85YSTA58cVCH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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