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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e421fa77add7c5c0841932d8063894842fca5b44822fc76ac12e62914179c0e' 
  AND token = 'CZqymVFZLs8Hj3nfs1dFmD2oiGNNsTViiH2nFTS+AEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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