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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64a60692a039b330c3d80077ccf01015f9f1da0e90a00e1aa61e64b0e42bcb8' 
  AND token = 'QMuUPXjXoUK6KAhASYyslGluzg/jUKrQUYRGJfcwpyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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