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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee01036e1224e2c9da222e1ad6da5121db0434b6ba2101b7381be9a6efa35e9' 
  AND token = 'eJh5eqsAKuIgoAqYsCIM/PoAeNoaNQYUHKhFH732Gtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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