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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ceeff2dc76fc5c41aeac30589d162ff5dde912b3c890bc3ea9a69c74f5c118' 
  AND token = 'PytX40Xq4eyxtH2Hs6IiMNeevyK6qwsJeb4T9rbc3Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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