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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab309e0dc5244991378af7157c7169e5d72a4b8d7f342288d170b2c510621ca' 
  AND token = 'VylBB4IaXH+XklrHlKCositL0gyczgTuux6pxcG01w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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