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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329f7736bcd5645f1ddcc843c340f71d5ed828bccaea39f5ac7a1f30675b978e' 
  AND token = 'mrgtO+wYU1KB/2edFAOif8Kqk67gAjA/a7IJZnaj5ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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