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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bb12669fc3c1f127b34429ca9792e7e625d328af32356b1e6bf0ef003e5cb5' 
  AND token = 'k6uWnsIKyjSuVPxWqnWp/fcqPnOVuEpctcBEdErV8jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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