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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66496f3dcc86906c587fb00ceb7f97ee7763af53c24994a5a8e7117ce7804de' 
  AND token = 'lQLK6f+QwQudg/VA5FZ4JW/g/11wockuT+nE7y4VkUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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