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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41733fca47dee59a734cb02527d4ed22db3edb621edd1184ae5c68557289b2ce' 
  AND token = '6D48bNv0+jCjY2yLe0eaPpn4BxEo+qeC0ntokASDuEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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