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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84603e238e7fd86a801dd130b484cd61b2363b1d4f0702bb4d89291e42828f6' 
  AND token = 'qJZnkZlr31gvtNl4OomALDqlTXUSdbg64Z268nRmgg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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