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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88d2b66b82e7d15ac7a40aa275862459a4b619952e60ab8e42729a0c8862d3d' 
  AND token = 'sU+0l5HN7le57CipkvvfXExNZzLzrQrLsJa0I1zt4QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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