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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512d41178fdb329ca1b26e3f9163953ff85f9cd9e65cef2ab3a77d4f29a1f6bf' 
  AND token = 'Hs5EPkTRGtTE5dgPZTcvrB/MGmY9MxZdl87yIUTTCZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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