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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760e8d07ab4c10cdd97dd1350bf652d4549384585c63293bc2a1861ecd16a892' 
  AND token = 'yz/Jf4aEarSfb3qIkbJ/8oIyd5Y3QOArKaoCWcTshfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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