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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63db455ace0e40ab05e4f006370ed4ddacb438d415d05d0185b310f8968f3071' 
  AND token = '1+DLl+PxfdGDTpHeK3o5Tz0ufaHBc7y0zVIXkEiyFOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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