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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f612eb3c47f09d67e8b3b458bab68155bb8cc1d20bb74bb6a688f13c7fb28707' 
  AND token = 'Q/HrEOc4p1t0cxzZ8MJTQzFmsdmX8mHwq4SBLAq+gSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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